MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b52667bbd4f7c03e8384a218fd44ff9fc76741a25baf8b658205191433914baa. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


OskiStealer


Vendor detections: 9


Intelligence 9 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b52667bbd4f7c03e8384a218fd44ff9fc76741a25baf8b658205191433914baa
SHA3-384 hash: b6e28387e586cfe342d581de5c62417eef7354d76cc19ae7cacb363b830ab3d96209d122840184e49187235da8169163
SHA1 hash: 0d3c255f9cdd9e123c91e7819ad2e318a0aedea0
MD5 hash: ff78d8bb9599aab5499aec11060c5a52
humanhash: montana-indigo-happy-sixteen
File name:Zamówienie zakupu # 49211.exe
Download: download sample
Signature OskiStealer
Create hunting rule
File size:1'080'320 bytes
First seen:2021-09-21 12:54:28 UTC
Last seen:2021-10-04 12:57:18 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash bc8cc1eea5c25ce2056d7da92bd98134 (9 x RemcosRAT, 3 x NetWire, 1 x AveMariaRAT)
ssdeep 12288:BSZPsJUL/MN/cen/VwTQBXcameDCnNmpeoAdrL7+o:bOQN/cu/VdBXKyCnEorP
Threatray 3'595 similar samples on MalwareBazaar
TLSH T16B356DE3B794D8F2EC34393EC94A711123256BF27C234E4D9D603E8AA9F4A50B9595C3
File icon (PE):PE icon
dhash icon 88a2b6b2aaaad4d4 (11 x RemcosRAT, 3 x Formbook, 2 x AveMariaRAT)
Reporter abuse_ch
Tags:exe geo OskiStealer POL

Intelligence

File Origin
# of uploads :
2
# of downloads :
218
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
I Ordine di acquisto 49211.ppam
Verdict:
Malicious activity
Analysis date:
2021-09-21 09:51:15 UTC
Tags:
macros macros-on-open opendir loader trojan stealer vidar
Link:
https://app.any.run/tasks/58ee9209-65bb-4933-a978-d1b11062d97a

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
SecuriteInfo.com.Variant.Zusy.401426.12281.16827.UNOFFICIAL
Create hunting rule

Malware family:
Oski Stealer
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/31dbee8b-48cc-40b2-8a66-32740da57fee
Result
Threat name:
Oski Vidar
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/854906
Signature
Detected unpacking (changes PE section rights)
Detected unpacking (overwrites its own PE header)
Downloads files with wrong headers with respect to MIME Content-Type
Found many strings related to Crypto-Wallets (likely being stolen)
Injects a PE file into a foreign processes
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Posts data to a JPG file (protocol mismatch)
Sigma detected: Execution from Suspicious Folder
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Crypto Currency Wallets
Yara detected Oski Stealer
Yara detected Vidar stealer
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 487336 Sample: Zam#U00f3wienie zakupu # 49... Startdate: 21/09/2021 Architecture: WINDOWS Score: 100 68 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->68 70 Multi AV Scanner detection for domain / URL 2->70 72 Multi AV Scanner detection for submitted file 2->72 74 8 other signatures 2->74 8 Ofwogcg.exe 13 2->8         started        12 Zam#U00f3wienie zakupu # 49211.exe 1 22 2->12         started        15 Ofwogcg.exe 13 2->15         started        process3 dnsIp4 76 Multi AV Scanner detection for dropped file 8->76 78 Detected unpacking (changes PE section rights) 8->78 80 Detected unpacking (overwrites its own PE header) 8->80 17 Ofwogcg.exe 196 8->17         started        60 cdn.discordapp.com 162.159.130.233, 443, 49734, 49735 CLOUDFLARENETUS United States 12->60 56 C:\Users\Public\Libraries\...\Ofwogcg.exe, PE32 12->56 dropped 82 Injects a PE file into a foreign processes 12->82 20 Zam#U00f3wienie zakupu # 49211.exe 196 12->20         started        23 cmd.exe 1 12->23         started        25 cmd.exe 1 12->25         started        62 162.159.133.233, 443, 49745 CLOUDFLARENETUS United States 15->62 27 Ofwogcg.exe 15->27         started        file5 signatures6 process7 dnsIp8 58 103.141.138.110, 49740, 49744, 49747 VNPT-AS-VNVIETNAMPOSTSANDTELECOMMUNICATIONSGROUPVN Viet Nam 20->58 30 cmd.exe 1 20->30         started        32 reg.exe 1 23->32         started        34 conhost.exe 23->34         started        36 cmd.exe 1 25->36         started        38 conhost.exe 25->38         started        48 C:\ProgramData\vcruntime140.dll, PE32 27->48 dropped 50 C:\ProgramData\sqlite3.dll, PE32 27->50 dropped 52 C:\ProgramData\softokn3.dll, PE32 27->52 dropped 54 4 other files (none is malicious) 27->54 dropped 64 Tries to harvest and steal browser information (history, passwords, etc) 27->64 66 Tries to steal Crypto Currency Wallets 27->66 file9 signatures10 process11 process12 40 taskkill.exe 1 30->40         started        42 conhost.exe 30->42         started        44 conhost.exe 32->44         started        46 conhost.exe 36->46         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b52667bbd4f7c03e8384a218fd44ff9fc76741a25baf8b658205191433914baa/
Threat name:
Win32.Backdoor.Remcos
Create hunting rule
Status:
Malicious
First seen:
2021-09-21 12:55:08 UTC
AV detection:
15 of 28 (53.57%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=wutgpo6u67ad5a4euimp2rh7t7dwoqncloxywzmcaumrim4rjova._file
Verdict:
malicious
Similar samples:
06c8a1e6544aede327bad32a5732d5bcfff143da73da01d34938efbe917e3289
OskiStealer
42c682af79cf1b73127ebf00349a8c4cabccdf42d2e14f77cda67121f870d8bf
OskiStealer
43460a1724b2521dd5e97c68c16edfce9caf22d49452efd956a64db91b5935a7
OskiStealer
44aa270e4c081241057bad8c1d0ea5864087325f8e3209aa10747f108123f718
OskiStealer
5953d0e6904dcb824fe1afde62ed8c2e2266f9f074514d395a31b759013e846f
OskiStealer
5ffe71b977866248e55612e20cea0bf3ad51a50896443d791081f58b49cdc5df
OskiStealer
83e8782266edec54f4c451f60e2095864c8a9d817e7296076e128c686a6bfea3
OskiStealer
a03b45dabcaf812402454befd876b2eafbdf9e967f3bb01e66f33f3cabbdebd5
OskiStealer
d950a4ee53971eb72e947a01bb1093a04676b7587fc0c6ccc26d9c964b1fc916
OskiStealer
+ 3'585 additional samples on MalwareBazaar
Result
Malware family:
oski
Create hunting rule
Score:
  10/10
Tags:
family:oski discovery infostealer persistence spyware stealer
Link:
https://tria.ge/reports/210921-p5sgnsheh9/
Behaviour
Checks processor information in registry
Kills process with taskkill
Modifies registry key
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Suspicious use of SetThreadContext
Accesses cryptocurrency files/wallets, possible credential harvesting
Adds Run key to start application
Checks installed software on the system
Loads dropped DLL
Reads user/profile data of web browsers
Downloads MZ/PE file
Oski
Malware Config
C2 Extraction:
103.141.138.110/p1/
Unpacked files
SH256 hash:
9df5839fe41103d241af27c07ec4fce4adfb9129cb57fe6d3fd9a396a750fb49
MD5 hash:
36e70e671e5390c2363ea8803df1c84a
SHA1 hash:
8905d18a2eb8299c800331aee4bbd05afa8f5bcc
Link:
https://www.unpac.me/results/67b3cf93-be98-404a-8d78-5a584848be84/
SH256 hash:
b52667bbd4f7c03e8384a218fd44ff9fc76741a25baf8b658205191433914baa
MD5 hash:
ff78d8bb9599aab5499aec11060c5a52
SHA1 hash:
0d3c255f9cdd9e123c91e7819ad2e318a0aedea0
Link:
https://www.unpac.me/results/67b3cf93-be98-404a-8d78-5a584848be84/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.64
Link:
https://yomi.yoroi.company/submissions/b52667bbd4f7c03e8384a218fd44ff9fc76741a25baf8b658205191433914baa

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:INDICATOR_SUSPICIOUS_EXE_UACBypass_EnvVarScheduledTasks
Create hunting rule
Author:ditekSHen
Description:detects Windows exceutables potentially bypassing UAC (ab)using Environment Variables in Scheduled Tasks
Rule name:MALWARE_Win_Vidar
Create hunting rule
Author:ditekSHen
Description:Detects Vidar / ArkeiStealer
Rule name:Vidar
Create hunting rule
Author:kevoreilly
Description:Vidar Payload
Rule name:win_oski_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:Detects win.oski.

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Malspam

OskiStealer

Executable exe b52667bbd4f7c03e8384a218fd44ff9fc76741a25baf8b658205191433914baa

(this sample)

  
Delivery method
Distributed via e-mail attachment
  
URLhaus
https://urlhaus.abuse.ch/url/1638496/

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